"I feel so sad right now, my heart is in pain. Just lost a longtime friend. My heart goes out to her family. R.I.P. Casey Johnson Love you," Paris Tweeted on Monday after hearing the news that Casey, a member of the Johnson & Johnson dynasty and Tila Tequila's fiancee, died in Los Angeles.

"In bed crying, looking at baby pictures of Casey, Nicky and I. I feel so upset. I feel like I've lost a sister. My heart is broken. Miss her," Paris wrote in another Tweet early Tuesday morning. "God has another Angel by his side. Casey, we all Love and Miss you and know that you are in a better place. R.I.P"

Tila, who announced her engagement to Casey via her Ustream account on December 9, was also expressing her pain on Twitter early Tuesday morning.

"I can't stop these haunting visions of her and I. We made such a lovely couple, only beginning to spend the rest of our lives together," Tila wrote.

The Los Angeles Police Department confirmed the news of Casey's death to Access Hollywood on Monday night.

According to TMZ, the body of the 30-year-old socialite was discovered on Monday morning. No details were immediately available about the cause of death.

Shortly after the news broke, a rep for the Johnson family issued a statement.

"The Johnson family is mourning its tragic loss, and asks for privacy during this very difficult time," the statement read.